问题补充：
Rising levels of carbon dioxide in the atmosphere are a major cause of climate change, and now a new study has confirmed that atmospheric CO2 is also affecting the ocean chemistry and potentially harming sea life.
Montana State University scientist Robert Dore has been researching the water in the Pacific Ocean for almost two decades. Weve been going to the same spot in the Pacific Ocean, and we try and characterize long-term change in the open ocean environment. And one of the key things that we measure is COx levels. And Weve been able to record this increasing quantity of atmospheric CO, into the ocean. Scientists expected that as atmospheric CO2 increased, more and一 more of the carbon dioxide would be absorbed into the ocean, affecting the chemical balance of the sea water, with a potentially harmful impact on shellfish and coral in particular.
As carbon dioxide dissolves in the water, or seawater in this case, it forms a weak acid, carbonic acid, Dore explains. And therefore, as the concentration of CO2 in the atmosphere goes up and that exchanges with the surface seawater, it drives the pH down, and makes it more acidic.
The seawater samples Dow and his colleagues have analyzed confirm what the theory predicts. The effect was particular striking at about 250 meters down, and again at 500 meters. Dore and his colleagues came up with two possible explanations. It could be that surface water picked up CO2 and then moved to those depths. Or there could be a biological explanation.
Its important to realize that the oceans are really becoming acidic. And it can have negative impacts on a whole variety of sea life from fish to coral. It’s potentially catastrophic.
【小题1】What can be the best title of the passage?A．Sea Life Facing DangerB．Scientist Researching SeawaterC．Oceans Becoming More AcidicD．Climate Change Affecting Seawater【小题2】With the increase of atmospheric C02，＿．A．more corals will appear in the seaB．the surface water is becoming warmerC．the chemical balance of the seawater is affectedD．the pH of the ocean out here has been increasing【小题3】Which of the following shows the process of the impact of atmospheric C02 on sea life?
a. Sea life is endangered. b. C02 goes into the surface water.
c. The ocean chemistry is affected. d. C02 levels in the atmosphere go up
e. C02 decreases the pH and makes the seawater more acidic.A．abcdeB．dbceaC．aebedD．edcba【小题4】Scientist Robert Dore came to the conclusion based on＿．A．his research and analysisB．the expectation of other scientistsC．some former theoryD．a major cause of climate changeA
答案：
(答案→)A
解析：这篇文章主要讲了二氧化碳的排放引起海水化学物质的改变从而是海洋动物受到危险。
【小题1】主旨题：从第一段的句子: Rising levels of carbon dioxide in the atmosphere are a major cause of climate change, atmospheric CO2 is also affecting the ocean chemistry and potentially harming sea life.可知文章主要讲的是海洋生物正在遭遇危险。选A。
【小题2】细节题：从第四段的句子And therefore, as the concentration of CO2 in the atmosphere goes up and that exchanges with the surface seawater, it drives the PH down, and makes it more acidic.可知海水的化学平衡受到影响。选 C。
【小题3】排序题：从第五段可知这个过程是：b. 二氧化碳进入水的表面。d. 大气中的二氧化碳的水平上升， c. 海洋的化学物质被影响， e. 二氧化碳减少了PH值，使海水的酸性更强。.a. 海洋生物受到危害。选B。
【小题4】细节题：从第二段和第六段可知Robert Dore是通过调查和分析得到这个结论的，答案是A。
